638125275 has 12 divisors (see below), whose sum is σ = 1055033912. Its totient is φ = 340333440.

The previous prime is 638125261. The next prime is 638125291. The reversal of 638125275 is 572521836.

It is not a de Polignac number, because 638125275 - 2⁴ = 638125259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4254094 + ... + 4254243.

Almost surely, 2^638125275 is an apocalyptic number.

638125275 is a deficient number, since it is larger than the sum of its proper divisors (416908637).

638125275 is a wasteful number, since it uses less digits than its factorization.

638125275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8508350 (or 8508345 counting only the distinct ones).

The product of its digits is 100800, while the sum is 39.

The square root of 638125275 is about 25261.1416012816. The cubic root of 638125275 is about 860.9316004429.

The spelling of 638125275 in words is "six hundred thirty-eight million, one hundred twenty-five thousand, two hundred seventy-five".